#define _CRT_SECURE_NO_WARNINGS 1

#include <iostream>
#include <string>
using namespace std;

int main()
{
	string str1 = "abcdefghijklmn";
	string str2 = "****";

	str1.insert(str1.begin() + 3, str2.begin(), str2.end());

	cout << str1;

	return 0;
}